Securing means for holding electric light bulbs in sockets



May '8, 31934. R. o. KRETSGHMAR SECURING MEANS FOR HOLDING ELECTRIC LIGHT BULBS IN SOCKETS Filed NOV. 15, 1932 Patented May 8, 1934 1.1; TATES PATNT FFICE SECURING MEANS FOR HOLDING ELECTRIG LIGHT BULBS IN SOCKETS 2 Claims.

lhe invention relates to means for holding electric light bulbs in sockets, and has for its principal object the provision of means to prevent loosening of electric light bulbs by vibration or otherwise, and providing a means that is reasonable in cost of manufacture and that is extremely eiiective in operation to prevent loosening of the light bulb endangering extinguishing the light and loss of the bulb.

1c The invention will be described in detail hereinafter and will be found illustrated in the accompanying drawing, in which Figure 1 is a side view in elevation of the shell of an electric socket showing a light bulb in posi tion therein and the means for preventing the loss of the bulb,

Figure 2 is a longitudinal sectional view of the shell showing the light bulb and its base in position therein,

29 Figure 3 is a transverse sectional view on a plane indicated by the line 3-3 of Figure 2, and

Figure 4 is a fragmentary view in elevation of the improved light bulb.

In the drawing similar reference characters are used to designate corresponding parts in all the views.

The invention is particularly adapted for use with threaded electric sockets, and in the drawing the shell of such a socket is shown at 10, and

adapted to receive the base 11 of an electric lamp, 12 designating the bulb of the lamp, and 13 a collar that is an extension of the threaded base 11 arranged adjacent to the bulb 12, said collar being provided with a plurality of indentations 5 14. The shell 10 has an offset extension 15 to receive the collar 13 when the lamp is screwed into position, and 16 is a grooved extension on the part 15 in which is secured an arcuate spring member 17 at one 0! its ends and its other end provided with an angular extension or lug 18 that engages through an opening 19 in the base of the groove 16 and in one 01' the indentations 14 to hold the electric light bulb from unscrewing when in proper position in the socket so as to eliminate the possibility of the light being extinguished when subjected to vibrations as are electric light bulbs on steamships, railroad trains, and 30 the like, such vibration oftentimes causing the lamps to unscrew from the sockets and break or become lost.

It will be apparent that the spring member 17 is exposed so that the lug 18 may be lifted or pried out of engaging position with collar 13 and its indentations when the lamp bulb is to be moved relatively to the socket so as to prevent injury to the lamp bulb in installing or removing it.

What is claimed is:

1. A light bulb holding means, comprising socket having a circumferential groove, an arcuate resilient member mounted in said groove and having an angularly disposed end extending 76 through an opening in the wall of the groove, and a light bulb engaging in said socket and having an indented collar to receive said angularly disposed end, said arcuate resilient member being exposed for removal of the angularly disposed end 80 from engagement with the indented collar for removal and replacement of the light bulb.

2. A light bulb holding means, comprising a threaded socket, an ofiset extension on said socket provided with a circumferential groove and an 86 opening in the base of the groove, 9. light bulb having a threaded base engaging in said socket and a collar engaging in said oilset extension and provided with indentations, and an arcuate resilient member engaged in said groove and having an 90 angular extension extending through said opening and engaging in an indentation in the collar, said arcuate resilient member being exposed for removal of the angularly disposed end from engagement with the collar for removal and re- 06 placement of the light bulb.

RICHARD 0. KRETSCHMAR. 

